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Spectroscopic Characteristics of Carbon Dots (C-Dots) Derived from Carbon Fibers and Conversion to Sulfur-Bridged C-Dots Nanosheets

Vinci, John C. and Ferrer, Ivonne M. and Guterry, Nathan W. and Colón, Verónica M. and Destino, Joel F. and Bright, Frank V. and Colón, Luis A. (2015) Spectroscopic Characteristics of Carbon Dots (C-Dots) Derived from Carbon Fibers and Conversion to Sulfur-Bridged C-Dots Nanosheets. Applied Spectroscopy, 69 (9). pp. 1082-1090. ISSN 0003-7028.

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We synthesized sub‐10 nm carbon nanoparticles (CNPs) consistent with photoluminescent carbon dots (C-dots) from carbon fiber starting material. The production of different C-dots fractions was monitored over seven days. During the course of the reaction, one fraction of C-dots species with relatively high photoluminescence was short-lived, emerging during the first hour of reaction but disappearing after one day of reaction. Isolation of this species during the first hour of the reaction was crucial to obtaining higher-luminescent C-dots species. When the reaction proceeded for one week, the appearance of larger nanostructures was observed over time, with lateral dimensions approaching 200 nm. The experimental evidence suggests that these larger species are formed from small C-dot nanoparticles bridged together by sulfur-based moieties between the C-dot edge groups, as if the C-dots polymerized by cross-linking the edge groups through sulfur bridges. Their size can be tailored by controlling the reaction time. Our results highlight the variety of CNP products, from sub‐10 nm C-dots to ~200 nm sulfur-containing carbon nanostructures, that can be produced over time during the oxidation reaction of the graphenic starting material. Our work provides a clear understanding of when to stop the oxidation reaction during the top-down production of C-dots to obtain highly photoluminescent species or a target average particle size.

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Additional Information:© 2015 Society for Applied Spectroscopy. Publication date: September 1, 2015. We acknowledge the financial support for this study by the National Science Foundation, USA: Grants CHE 1058373, CHE 1048740 (CRIFMU), CHE-0848171, and CHE-1126301. The authors thank Dr. David Watson for use of the UV-Vis and fluorescence spectrophotometers, Dr. Sarbajit Banerjee for providing access to the Raman spectrophotometer, and Dr. Joseph A. Gardella for discussions on XPS.
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Subject Keywords:C-dots; Carbon dots; Carbon nanomaterials; Carbon nanoparticles; Carbon nanosheets; Graphene oxide; Photoluminescence nanoparticles
Issue or Number:9
Record Number:CaltechAUTHORS:20151023-080949581
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61465
Deposited By: Tony Diaz
Deposited On:26 Oct 2015 20:02
Last Modified:03 Oct 2019 09:08

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